Change Link to List in FunctionSignature.

pkg/compiler/lib/src/js_backend/patch_resolver.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.js_backend.patch_resolver;
 
 import '../dart2jslib.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart';
@@ skipping 16 matching lines @@
       checkMatchingPatchSignatures(element, patch);
       element = patch;
     } else {
       compiler.reportError(
          element, MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION);
     }
     return element;
   }
 
   void checkMatchingPatchParameters(FunctionElement origin,
-                                    Link<Element> originParameters,
-                                    Link<Element> patchParameters) {
-    while (!originParameters.isEmpty) {
-      ParameterElementX originParameter = originParameters.head;
-      ParameterElementX patchParameter = patchParameters.head;
+                                    List<Element> originParameters,
+                                    List<Element> patchParameters) {
+
+    assert(originParameters.length == patchParameters.length);
+    for (int index = 0; index < originParameters.length; index++) {
+      ParameterElementX originParameter = originParameters[index];
+      ParameterElementX patchParameter = patchParameters[index];
       // TODO(johnniwinther): Remove the conditional patching when we never
       // resolve the same method twice.
       if (!originParameter.isPatched) {
         originParameter.applyPatch(patchParameter);
       } else {
         assert(invariant(origin, originParameter.patch == patchParameter,
                message: "Inconsistent repatch of $originParameter."));
       }
       DartType originParameterType = originParameter.computeType(compiler);
       DartType patchParameterType = patchParameter.computeType(compiler);
@@ skipping 27 matching lines @@
               originParameter.parseNode(compiler),
               MessageKind.PATCH_PARAMETER_MISMATCH,
               {'methodName': origin.name,
                'originParameter': originParameterText,
                'patchParameter': patchParameterText});
           compiler.reportInfo(patchParameter,
               MessageKind.PATCH_POINT_TO_PARAMETER,
               {'parameterName': patchParameter.name});
         }
       }
-
-      originParameters = originParameters.tail;
-      patchParameters = patchParameters.tail;
     }
   }
 
   void checkMatchingPatchSignatures(FunctionElement origin,
                                     FunctionElement patch) {
     // TODO(johnniwinther): Show both origin and patch locations on errors.
     FunctionExpression originTree = origin.node;
     FunctionSignature originSignature = origin.functionSignature;
     FunctionExpression patchTree = patch.node;
     FunctionSignature patchSignature = patch.functionSignature;
@@ skipping 47 matching lines @@
              'patchParameterCount': patchSignature.optionalParameterCount});
       });
     } else {
       checkMatchingPatchParameters(origin,
                                    originSignature.optionalParameters,
                                    patchSignature.optionalParameters);
     }
   }
 
 }